In general people tend to estimate their body fat percentages as being lower than they really are. 16% is still pretty lean, so if you are honestly looking fat-ish, you may be higher even. Either way, diet is everything. The ability to control what you eat, and to log it is huge. Every two hours eating could, potentially, have negative effects on insulin sensitivity. For most people the wave of high blood glucose from eating, up to peak and back to normal is just under two hours, so you are really stressing your system. Shifting out to three hours, and walking within an hour of eating could help you a lot.